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Earth’s climate has changed since the planet’s beginning. While earlier climate-change events were related to natural forces, recent warming is distinctly related to human activities. Jeff Dozier, professor of Environmental Science and Management at the University of California, Santa Barbara, explores the history of climate change in depth each year in his graduate-level Earth System Science class. To help students visualize events through the ages, he is developing a comprehensive history of climate change using ChronoZoom. The timeline includes images, charts, and videos that illustrate major climate changes from the beginning of time through modern day.